Chucking device



March 12, 1946. C, c, VEALE CHUCKING DEVICE Filed June l0, 1944 PatentedMar. 12, 1946 `UNITED 'STATES PATENT A.OFFICE y CHUCKING DEVICE CharlesC. Veale, Wheaton, Ill., assigner to Western Electric Company,Incorporated, New York, N. Y.,l a corporation of New York ApplicationJune 10, 1944, Serial No. 539,771

4 Claims.

in so supporting the tubes in a lathe that the edges of the tubes willnot be crushed while still holding them with a tightV enough grip sothatthey may bel rotated during the machining of"`V them.

It is an object of the present invention to provide a simple andetlicient chucking device which will adequately support an article beingmachined without damage to the article.

In accordance with one embodiment of the invention, a cylinder blockisvrigi'dly mounted on the tail stock of a lathe and has a fluidactuatable piston therein for reciprocating a bearing member, which, inturn, has freely rotatable in it a clamping element adapted to engageand resiliently clamp a ceramic tube against a clamping surface of achuck supported clamping member.

By thus supporting the ceramic tube to be machined, the amount ofpressure applied to the ends of the tube may be finely regulated.

A complete understanding of the invention may be had by reference to thefollowing detailed de scription when considered in commotion with theaccompanying drawing, wherein Fig. 1 is a plan view of a portion of alathe havingl a chucking device, made in accordance with the presentinvention, supported thereon;

Fig. 2 is a fragmentary vertical sectional view taken substantiallyalong the line 2--2 of Fig. lV

in the direction of the arrows showing details of construction of thechucking mechanism partly in elevation.

Fig. 3 is a fragmentary plan sectional view taken substantially alongthe line 3-3 oi'- Fig. 2

in the direction oi the arrows showing part of the control mechanism forsupplying the iluid t actuate the piston: and 1 Fig. 4 is a fragmentaryvertical sectional view taken substantially along the line 4-4 oi' Fig.2 in the direction of the arrows showing further details of the controlmechanism for controlling the supply of iluid to the piston.

In the drawing, wherein like referencecharacters designate the sameparts throughout the several views, as shown particularly in Fig. 1, atail stock i oi a suitable lathe has mounted in it a supporting memberli. which may be locked in position on the tail stock by manipulation ofa clamp actuating L/handle i2, as is usual in such devices. The supportmember I i is provided with 5 an annular integrally formed collar orshoulder I3, from which there extends a projection it. winch, incooperation with the collar or shoulder, serves to support a cylinderblock i5 rigidly with respect to the tail stock iii. The cylinder blockl0 i5 may be xed to the support member Ii in any suitable manner, forexample, by machine screws IB extending through the shoulder I3 andthread Vedintc the cylinder block i 6.

The cylinder block l5 has a cylindrical cavity l5 2i] formed in it, theright end oi which is closed by the projection i4. ton 2i is mounted forreciprocation and the piston 2i carries a-piston rod 22, which, in turn,is reciprocable in a cylindrical cavity 23 coaxial with the cavity 20.Fluid under pressure may be admitted to either end of the cavity throughports 24 and 25 at the ends of passages 23 and 2l. respectively. Thepassages 26 and 21 termi- 'nate in valve ports 28 and 29, with which afeeo cavity formed in a valve member 3i may be alternately associated.The valve member 3l is provided with a handle 32, whereby it may berocked about a pivot pin 33 to move its cavity 30 into association witheither the port 28 or the port 29. Fluid under pressure from a suitablesource is connected through a hose connection 34 to a port 35 in theblock i5 and thence into the cavity 30. The orilce of the port 35 may beadjusted by means of a needle valve member 36. which is threaded intothe block 35 and locked in place by means of a lock nut 31, thus toregulate the flow of fluid'into the cavity 30. The valve member 3| maybe set in either of two positions and will be held in its adjustedposition by means of a spring-pressed ball 33 engaging in either one ofa pair of depressions 39 or 40 formed in the valve member. Theconguration of the body of the valve member 3i is such that when thevalve member is in the position shown in Fig. 2, a bleeder port 5 i incommunication with the passage 26, will be open to the atmosphere andwill thus permit fluid under pressure to escape from the left end of thecylindrical cavity 20, whereas a bleeder port 52, in communication withthe pessage 21, will be blocked by the surface of the body of thevalve3l. When the handle 32 is moved counter-clockwise (Fig. 2) to itsopposite position. the cavity 30 will be in communication with the port28, the bleeder port Il will be 55 blocked and bleeder Dort I2 will beopen to the In this cavity 2li, a pis--

